c#操作Access[下]

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话接上回。

介绍之前先介绍一个结构体。因为以下函数都要用到这个结构体。

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//普通的节点   
public struct Node  
{  
    private string nodeType;  
    public string NodeType//表的字段名   
    {  
        set { nodeType = value; }  
        get { return nodeType; }  
    }  
 
    private string nodeValue;  
    public string NodeValue//具体的值   
    {  
        set { nodeValue = value; }  
        get { return nodeValue; }  
    }  
}  
 
//照片节点   
public struct PictureNode  
{  
    private string nodeType;  
    public string NodeType//照片的列名   
    {  
        set { nodeType = value; }  
        get { return nodeType; }  
    }  
 
    private byte[] nodeValue;  
    public byte[] NodeValue//照片的值，注意类型   
    {  
        set { nodeValue = value; }  
        get { return nodeValue; }  
    }  
} 
    //普通的节点
    public struct Node
    {
        private string nodeType;
        public string NodeType//表的字段名
        {
            set { nodeType = value; }
            get { return nodeType; }
        }

        private string nodeValue;
        public string NodeValue//具体的值
        {
            set { nodeValue = value; }
            get { return nodeValue; }
        }
    }

    //照片节点
    public struct PictureNode
    {
        private string nodeType;
        public string NodeType//照片的列名
        {
            set { nodeType = value; }
            get { return nodeType; }
        }

        private byte[] nodeValue;
        public byte[] NodeValue//照片的值，注意类型
        {
            set { nodeValue = value; }
            get { return nodeValue; }
        }
    }

具体就用不着多加描述了吧！继续看问题点。

1.向table中插入数据（按行插入，如果需要插入多条请自己组织这个函数就ok了），其中的 insertArray存储的是一系列Node，pictureNode是PictureNode。
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//插入数据   
  public static bool InsertRow( string mdbPath, string tableName, ArrayList insertArray,   
       PictureNode pictureNode, ref string errinfo)  
  {  
      try 
      {  
          //1、建立连接   
          string strConn  
              = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + mdbPath + ";Jet OLEDB:Database Password=haoren";  
          OleDbConnection odcConnection = new OleDbConnection(strConn);  
          //2、打开连接   
          odcConnection.Open();  
 
          string str_col = "";  
          int size_col = insertArray.Count;  
          for (int i = 0; i < size_col; i++)  
          {  
              Node vipNode = new Node();  
              vipNode = (Node)insertArray[i];  
              str_col += vipNode.NodeType + ",";  
          }  
          str_col = str_col.TrimEnd(',');  
 
 
          int size_row = insertArray.Count;  
          string str_row = "";  
          for (int i = 0; i < size_row; i++)  
          {  
              Node vipNode = new Node();  
              vipNode = (Node)insertArray[i];  
              string v = vipNode.NodeValue.ToString();  
              v = DealString(v);  
              if (v == "")  
              {  
                  str_row += "null" + ',';  
              }  
              else 
              {  
                  str_row += "'" + v + "'" + ',';  
              }  
          }  
          str_row = str_row.TrimEnd(',');  
          if (pictureNode　!= null && pictureNode.NodeValue != null)  
          {  
              str_col += ',' + pictureNode.NodeType;  
              str_row += ",@Image";  
          }  
          string sql = "insert into " + tableName + @" (" + str_col + ") values" + @"(" + str_row + ")";  
          OleDbCommand odCommand = new OleDbCommand(sql, odcConnection);  
          if (pictureNode != null　&& pictureNode.NodeValue != null)  
          {  
              odCommand.Parameters.Add("@Image", OleDbType.VarBinary, pictureNode.NodeValue.Length).Value = pictureNode.NodeValue;  
          }  
          odCommand.ExecuteNonQuery();  
          odcConnection.Close();  
          return true;  
      }  
      catch (Exception err)  
      {  
          errinfo =  err.Message;  
          return false;  
      }  
  } 
      //插入数据
        public static bool InsertRow( string mdbPath, string tableName, ArrayList insertArray,
             PictureNode pictureNode, ref string errinfo)
        {
            try
            {
                //1、建立连接
                string strConn
                    = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + mdbPath + ";Jet OLEDB:Database Password=haoren";
                OleDbConnection odcConnection = new OleDbConnection(strConn);
                //2、打开连接
                odcConnection.Open();

                string str_col = "";
                int size_col = insertArray.Count;
                for (int i = 0; i < size_col; i++)
                {
                    Node vipNode = new Node();
                    vipNode = (Node)insertArray[i];
                    str_col += vipNode.NodeType + ",";
                }
                str_col = str_col.TrimEnd(',');


                int size_row = insertArray.Count;
                string str_row = "";
                for (int i = 0; i < size_row; i++)
                {
                    Node vipNode = new Node();
                    vipNode = (Node)insertArray[i];
                    string v = vipNode.NodeValue.ToString();
                    v = DealString(v);
                    if (v == "")
                    {
                        str_row += "null" + ',';
                    }
                    else
                    {
                        str_row += "'" + v + "'" + ',';
                    }
                }
                str_row = str_row.TrimEnd(',');
                if (pictureNode　!= null && pictureNode.NodeValue != null)
                {
                    str_col += ',' + pictureNode.NodeType;
                    str_row += ",@Image";
                }
                string sql = "insert into " + tableName + @" (" + str_col + ") values" + @"(" + str_row + ")";
                OleDbCommand odCommand = new OleDbCommand(sql, odcConnection);
                if (pictureNode != null　&& pictureNode.NodeValue != null)
                {
                    odCommand.Parameters.Add("@Image", OleDbType.VarBinary, pictureNode.NodeValue.Length).Value = pictureNode.NodeValue;
                }
                odCommand.ExecuteNonQuery();
                odcConnection.Close();
                return true;
            }
            catch (Exception err)
            {
                errinfo =  err.Message;
                return false;
            }
        }

2.更新一行的数据（与插入类似）

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//更新一行数据   
 public static bool UpdateRow(string mdbPath, string tableName,   
     Node keyNode,ArrayList insertArray,PictureNode pictureNode, ref string errinfo)  
 {  
     try 
     {  
         //1、建立连接   
         string strConn  
             = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + mdbPath + ";Jet OLEDB:Database Password=haoren";  
         OleDbConnection odcConnection = new OleDbConnection(strConn);  
         //2、打开连接   
         odcConnection.Open();  
 
         int size = insertArray.Count;  
         string str = "";  
         for (int i = 0; i < size; i++)  
         {  
             Node node = new Node();  
             node = (Node)insertArray[i];  
             string v = node.NodeValue.ToString();  
             v = DealString(v);  
             str += node.NodeType + " = ";  
             if (v == "")  
             {  
                 str += "null" + ',';  
             }  
             else 
             {  
                 str += "'" + v + "'" + ',';  
             }  
               
         }  
         str = str.TrimEnd(',');  
         if (pictureNode.NodeValue != null)  
         {  
             str += ',' + pictureNode.NodeType;  
             str += " = @Image";  
         }  
         string sql = "update " + tableName + " set " + str +  
             " where " + keyNode.NodeType + " = " + "'" + keyNode.NodeValue + "'";  
         OleDbCommand odCommand = new OleDbCommand(sql, odcConnection);  
         if (pictureNode.NodeValue != null)  
         {  
             odCommand.Parameters.Add("@Image", OleDbType.VarBinary, pictureNode.NodeValue.Length).Value = pictureNode.NodeValue;  
         }  
         odCommand.ExecuteNonQuery();  
         odcConnection.Close();  
         return true;  
     }  
     catch (Exception err)  
     {  
         errinfo = err.Message;  
         return false;  
     }  
 } 
       //更新一行数据
        public static bool UpdateRow(string mdbPath, string tableName,
            Node keyNode,ArrayList insertArray,PictureNode pictureNode, ref string errinfo)
        {
            try
            {
                //1、建立连接
                string strConn
                    = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + mdbPath + ";Jet OLEDB:Database Password=haoren";
                OleDbConnection odcConnection = new OleDbConnection(strConn);
                //2、打开连接
                odcConnection.Open();

                int size = insertArray.Count;
                string str = "";
                for (int i = 0; i < size; i++)
                {
                    Node node = new Node();
                    node = (Node)insertArray[i];
                    string v = node.NodeValue.ToString();
                    v = DealString(v);
                    str += node.NodeType + " = ";
                    if (v == "")
                    {
                        str += "null" + ',';
                    }
                    else
                    {
                        str += "'" + v + "'" + ',';
                    }
                   
                }
                str = str.TrimEnd(',');
                if (pictureNode.NodeValue != null)
                {
                    str += ',' + pictureNode.NodeType;
                    str += " = @Image";
                }
                string sql = "update " + tableName + " set " + str +
                    " where " + keyNode.NodeType + " = " + "'" + keyNode.NodeValue + "'";
                OleDbCommand odCommand = new OleDbCommand(sql, odcConnection);
                if (pictureNode.NodeValue != null)
                {
                    odCommand.Parameters.Add("@Image", OleDbType.VarBinary, pictureNode.NodeValue.Length).Value = pictureNode.NodeValue;
                }
                odCommand.ExecuteNonQuery();
                odcConnection.Close();
                return true;
            }
            catch (Exception err)
            {
                errinfo = err.Message;
                return false;
            }
        }

3.  插入图片数据.

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//插入图片数据   
 public static bool InsertPictureToMDB(string mdbPath,  string tableName,Node keyNode,  
     PictureNode pictureNode,ref string errinfo)  
 {  
     try 
     {  
         //1、建立连接   
         string strConn  
             = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + mdbPath + ";Jet OLEDB:Database Password=haoren";  
         OleDbConnection odcConnection = new OleDbConnection(strConn);  
         //2、打开连接   
         odcConnection.Open();  
         string sql = @"update " + tableName + " set " + pictureNode.NodeType + "=" 
             + "@Image where " + keyNode.NodeType + "=" + "'"+keyNode.NodeValue+"'";  
         OleDbCommand comm = new OleDbCommand(sql, odcConnection);  
         byte[] pic = pictureNode.NodeValue;  
         comm.Parameters.Add("@Image", OleDbType.VarBinary, pic.Length).Value = pic;  
         comm.ExecuteNonQuery();  
         odcConnection.Close();  
         return true;  
     }  
     catch (Exception err)  
     {  
         errinfo = err.Message;  
         return false;  
     }  
 } 
       //插入图片数据
        public static bool InsertPictureToMDB(string mdbPath,  string tableName,Node keyNode,
            PictureNode pictureNode,ref string errinfo)
        {
            try
            {
                //1、建立连接
                string strConn
                    = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + mdbPath + ";Jet OLEDB:Database Password=haoren";
                OleDbConnection odcConnection = new OleDbConnection(strConn);
                //2、打开连接
                odcConnection.Open();
                string sql = @"update " + tableName + " set " + pictureNode.NodeType + "="
                    + "@Image where " + keyNode.NodeType + "=" + "'"+keyNode.NodeValue+"'";
                OleDbCommand comm = new OleDbCommand(sql, odcConnection);
                byte[] pic = pictureNode.NodeValue;
                comm.Parameters.Add("@Image", OleDbType.VarBinary, pic.Length).Value = pic;
                comm.ExecuteNonQuery();
                odcConnection.Close();
                return true;
            }
            catch (Exception err)
            {
                errinfo = err.Message;
                return false;
            }
        }

4.修改mdb的一条数据.

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//修改mdb的一条数据   
public static bool UpdateMDBNode( string tableName, Node keyNode,  
    Node saveNode, ref string errinfo)  
{  
    try 
    {  
        //1、建立连接   
        string strConn  
            = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + mdbPath + ";Jet OLEDB:Database Password=haoren";  
        OleDbConnection odcConnection = new OleDbConnection(strConn);  
        //2、打开连接   
        odcConnection.Open();  
          
        string sql = @"update "+ tableName+" set " + saveNode.NodeType + " = '" + saveNode.NodeValue+  
            "' where " + keyNode.NodeType + " = " + "'" + keyNode.NodeValue + "'";  
        OleDbCommand comm = new OleDbCommand(sql, odcConnection);  
        comm.ExecuteNonQuery();  
        odcConnection.Close();  
        return true;  
    }  
    catch (Exception err)  
    {  
        errinfo = err.Message;  
        return false;  
    }  
} 
        //修改mdb的一条数据
        public static bool UpdateMDBNode( string tableName, Node keyNode,
            Node saveNode, ref string errinfo)
        {
            try
            {
                //1、建立连接
                string strConn
                    = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + mdbPath + ";Jet OLEDB:Database Password=haoren";
                OleDbConnection odcConnection = new OleDbConnection(strConn);
                //2、打开连接
                odcConnection.Open();
               
                string sql = @"update "+ tableName+" set " + saveNode.NodeType + " = '" + saveNode.NodeValue+
                    "' where " + keyNode.NodeType + " = " + "'" + keyNode.NodeValue + "'";
                OleDbCommand comm = new OleDbCommand(sql, odcConnection);
                comm.ExecuteNonQuery();
                odcConnection.Close();
                return true;
            }
            catch (Exception err)
            {
                errinfo = err.Message;
                return false;
            }
        }

5.从mdb中获得照片

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//从mdb中获得照片   
    public static byte[] GetImageFromMDB( string tableName, Node keyNode)  
    {  
        try 
        {  
            string sql = "Select 照片 From " + tableName +  
                " member Where " + keyNode.NodeType + " = " 
                + "'" + keyNode.NodeValue + "'";  
            string strConn  
                = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + mdbPath + ";Jet OLEDB:Database Password=haoren";  
            OleDbConnection odcConnection = new OleDbConnection(strConn);  
            //2、打开连接   
            odcConnection.Open();  
            OleDbCommand comm = new OleDbCommand(sql, odcConnection);  
            OleDbDataReader sdr = comm.ExecuteReader();  
            sdr.Read();  
 
            byte[] pic = (byte[])sdr[0];  
            sdr.Close();  
            odcConnection.Close();  
            return pic;  
        }  
        catch   
        {  
            return null;  
        }  
    } 
    //从mdb中获得照片
        public static byte[] GetImageFromMDB( string tableName, Node keyNode)
        {
            try
            {
                string sql = "Select 照片 From " + tableName +
                    " member Where " + keyNode.NodeType + " = "
                    + "'" + keyNode.NodeValue + "'";
                string strConn
                    = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + mdbPath + ";Jet OLEDB:Database Password=haoren";
                OleDbConnection odcConnection = new OleDbConnection(strConn);
                //2、打开连接
                odcConnection.Open();
                OleDbCommand comm = new OleDbCommand(sql, odcConnection);
                OleDbDataReader sdr = comm.ExecuteReader();
                sdr.Read();

                byte[] pic = (byte[])sdr[0];
                sdr.Close();
                odcConnection.Close();
                return pic;
            }
            catch
            {
                return null;
            }
        }

到此以上描述问题，全部解决。这些程序代码都在net2005下测试通过。希望能给大家带来一些帮助。

补充一句：转载的朋友请一定注明出处谢谢！半支烟阿杰 http://blog.csdn.net/gisfarmer/

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本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/gisfarmer/archive/2009/01/04/3701136.aspx#999696

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原文地址：https://www.cnblogs.com/chengulv/p/1787026.html